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Old 06-12-2014, 17:14   #16
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Re: Help: Underwater sanding of depth sounder transducer

Will not comment on sounder BUT for ALL wet sanding, including anti-fouling, (and also dry) use 'ABRANET' !!! You will be amazed at the results and how long it will last you.
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Old 06-12-2014, 19:42   #17
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Re: Help: Underwater sanding of depth sounder transducer

I painted my transducer{Airmar/Raymarine}with Altex anti foul and it ruined it. Even removing the paint did not fix the problem. I then read the manual which said to use a water base anti foul. Used the correct paint on the new transducer, not problem. A $400 lesson.
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Old 07-12-2014, 04:50   #18
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Re: Help: Underwater sanding of depth sounder transducer

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Originally Posted by Jim Cate View Post
... I suspect that the admonition to not paint is more to do with worries about the solvents in the paint attacking the plastic surface of the transducer than reduction of sensitivity...
Indeed.

Here's what Airmar have to say about this one:

"Use water based anti-fouling paint only. Never use ketone-based paint, since ketones can attack many plastics possibly damaging the transducer. We recommend brands such as MDR, Woolsey, Pettit, and Sea Hawk. These water-based anti-fouling paints can be found at your local marine supply store or contact one of our distributors."

Airmar FAQ - What anti-fouling paint should I use on my transducer?
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Old 07-12-2014, 10:52   #19
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Re: Help: Underwater sanding of depth sounder transducer

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Originally Posted by sustutt View Post
Is it possible to sand the transducer underwater? And if so, what material should I use? What are possible problems?
An ablative paint will come off fairly easily with a wire brush or a really abrasive scrub pad. A hard paint will require more, a scraper and wire brush perhaps. In either case, with care, you will not damage the transducer.

One issue is that while you are exerting pressure applying the tool of choice upward against the transducer, you will be pushing yourself downward away from the work. Using a suction cup with your free hand will allow you to put some elbow grease into it.


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Old 07-12-2014, 11:34   #20
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Re: Help: Underwater sanding of depth sounder transducer

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Originally Posted by fstbttms View Post
An ablative paint will come off fairly easily with a wire brush or a really abrasive scrub pad. A hard paint will require more, a scraper and wire brush perhaps. In either case, with care, you will not damage the transducer.

One issue is that while you are exerting pressure applying the tool of choice upward against the transducer, you will be pushing yourself downward away from the work. Using a suction cup with your free hand will allow you to put some elbow grease into it.


The most important tool being the one on the right!
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Old 10-12-2014, 02:58   #21
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Re: Help: Underwater sanding of depth sounder transducer

My Airmar depth transducer has been spray painted with the harder black racing bottom paint and has not interfered with the depth sensing function at all. The paint though, has made it harder to pull the transducer to 'exercise' it in the through hull fitting to inspect, replace/service 0-rings. Hmm?
I have called Airmar in the past with questions and they have been very helpful. Give them a call? 803-693-0777
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Old 10-12-2014, 03:04   #22
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Re: Help: Underwater sanding of depth sounder transducer

Cheechako--
That was really funny--but this guy is trying to get his depth sounder reporting!
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